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Coming soon in 2015!

Shinmai Maou no Keiyakusha Wiki is dedicated to the Light Novel series The Testament of Sister New Devil (新妹魔王の契約者『テスタメント』) written by Uesu Tetsuto and illustrated by Ōkuma Nekosuke (Nitro+) with six volumes released since September 2012. The manga adaptation is written again by Uesu Tetsuto but is drawn by Miyakokasiwa and has been serialized since May 2013. Another seinen version of the manga is illustrated by Fumihiro Kiso and began serialization in February 2014. An anime adaptation will be aired in 2015, with it being directed by Hisashi Saito.

"Hey, you said you wanted a little sister, right?" High school freshman, Basara Tojo, was suddenly asked this question by his father who tells him that he's getting remarried. He then departed overseas after bringing Basara two beautiful step-sisters; Mio and Maria. But the true forms of the two girl's are actually a newbie Demon Lord and a succubus! Basara was almost forced into a master and servant contract with Mio, but a "reversed" contract was formed by mistake, and Basara is now the master. Moreover, Basara is being hit by ecchi situations one after another due to the contract, but Mio's life is being pursued by other demon tribes and hero tribes!! The most powerful contractor's desire action drama begins!

Light Novel Volume VI was released on the 1st of September! New!

Manga Volume 3 was released on the 26th of August! New!

The anime of The Testament of Sister New Devil is set to air in 2015!

Volume 2, Chapter 3 of the Light Novel has been translated by Baka-Tsuki!

Yuuki Nonaka (野中 柚希 Nonaka Yūki) is a member of the Hero Tribe in Japan and a childhood friend of Basara Tojo. She is one of the survivors of the Bryhildr incident five years ago and is currently the observer of Mio Naruse, a rank S- surveillance target. Yuuki is in the same class as Basara and Mio in Hijirigasaka Academy, being the Class Representative. The Hero is a Skill type fighter with abilities on a B+ rank and uses the spirit sword Sakuya. She is the sister of Kurumi Nonaka and one of the main female protagonists of the series.

The following contains spoilers. You have been warned, click here to view contents.

After Takashi's arrival, Maria notices the abnormal aura emitted by his spear, Byakko, which houses a divine beast with strong powers over wind. Shiba reveals his presence from behind the Tojo/Naruses which prompts Basara to stand between Mio and him. The heroes reveal their objective which is Mio's elimination due to her status changing. Kurumi and Yuki also join the crowd while reaffirming their resolve to fight Basara if necessary. Kurumi and Takashi clash against Basara and Maria, creating a crater where the impact took place. Shiba stops the fight by destroying the barrier separating them from the real world and postpones the battle till a week later. During the following day at school, Yahiro states that he will eliminate the Heroes threatening Mio's existence which angers Basara. Immediately after Yahiro leaves, Chisato offers Basara some advice and ends their encounter with a kiss on his forehead. Soon after, Basara, Mio and Maria begin their training.Read the chapter!